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5 January, 16:18

Viruses and bacteria - critical thinking work sheet

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  1. 5 January, 18:59
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    A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.

    Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometers in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals.

    Viruses are even smaller than bacteria and require living hosts-such as people, plants or animals-to multiply. Otherwise, they can't survive. When a virus enters your body, it invades some of your cells and takes over the cell machinery, redirecting it to produce the virus.
  2. 5 January, 19:01
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    Some bacteria is healthy and some aren’t. There’s no such thing as a healthy virus.
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